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  2. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The algorithm enables a computer to print calendar and diary pages for past or future sequences of any desired length from the reform of the calendar, which in England was 3/14 September 1752. The article Date of Easter gives algorithms for calculating the date of Easter. Combining the two enables the page headers to show any fixed or movable ...

  3. Lilian date - Wikipedia

    en.wikipedia.org/wiki/Lilian_date

    Lilian dates can be used to calculate the number of days between any two dates occurring since the beginning of the Gregorian calendar. It is currently used by date conversion routines that are part of IBM Language Environment (LE) software [2] and in IBM AIX COBOL. [3] The Lilian date is only a date format: it is not tied to any particular ...

  4. Determination of the day of the week - Wikipedia

    en.wikipedia.org/wiki/Determination_of_the_day...

    The Rata Die method works by adding up the number of days d that has passed since a date of known day of the week D. The day of-the-week is then given by (D + d) mod 7, conforming to whatever convention was used to encode D. For example, the date of 13 August 2009 is 733632 days from 1 January AD 1. Taking the number mod 7 yields 4, hence a ...

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  6. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    The Coptic calendar has 13 months, 12 of 30 days each, and one at the end of the year of 5 days, or 6 days in leap years. The Coptic Leap Year follows the same rules as the Julian Calendar so that the extra month always has 6 days in the year before a Julian Leap Year. [ 47 ]

  7. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the

  8. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    Gregory's calendar reform modified the Julian rule, to reduce the average length of the calendar year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year: the Gregorian calendar gains just 0.1 day over 400 years. For any given event during the years from 1901 through 2099, its date according ...

  9. Here’s When and Why We Get a Bonus Day in February 2024 - AOL

    www.aol.com/lifestyle/why-extra-day-february...

    The Julian calendar added around ten days to each year, making each month either 30 or 31 days long, except for February. February, the last month in their calendar, was designated with 28 days ...